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Studying nanoparticles' 3D shape by aspect maps: Determination of the morphology of bacterial magnetic nanoparticles
CNR, Ist Struttura Mat, I-00015 Monterotondo, RM, Italy.;Univ Belgrade, Vinca Inst Nucl Sci, POB 522, Belgrade 11001, Serbia..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics. CNR, Ist Struttura Mat, I-00015 Monterotondo, RM, Italy.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Univ Duisburg Essen, Fac Phys, Lotharstr 1, D-47048 Duisburg, Germany.;Univ Duisburg Essen, CENIDE, Lotharstr 1, D-47048 Duisburg, Germany..
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2016 (English)In: Faraday discussions (Online), ISSN 1359-6640, E-ISSN 1364-5498, Vol. 191, 177-188 p.Article in journal (Refereed) Published
Abstract [en]

Magnetic nanoparticles (MNPs) are widely investigated due to their potential use in various applications, ranging from electronics to biomedical devices. The magnetic properties of MNPs are strongly dependent on their size and shape (i.e., morphology), thus appropriate tools to investigate their morphology are fundamental to understand the physics of these systems. Recently a new approach to study nanoparticle morphology by Transmission Electron Microscopy (TEM) analysis has been proposed, introducing the so-called Aspect Maps (AMs). In this paper, a further evolution of the AM method is presented, allowing determination of the nanoparticles' 3D shape by TEM image. As a case study, this paper will focus on magnetite nanoparticles (Fe3O4), with a mean size of similar to 45 nm extracted from Magnetospirillum gryphiswaldense magnetostatic bacteria (MTB). The proposed approach gives a complete description of the nanoparticles' morphology, allowing estimation of an average geometrical size and shape. In addition, preliminary investigation of the magnetic properties of MTB nanoparticles was performed, giving some insight into interparticle interactions and on the reversal mechanism of the magnetization.

Place, publisher, year, edition, pages
2016. Vol. 191, 177-188 p.
National Category
Chemical Sciences Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-308061DOI: 10.1039/c6fd00059bISI: 000385257300011PubMedID: 27438136OAI: oai:DiVA.org:uu-308061DiVA: diva2:1049157
Available from: 2016-11-23 Created: 2016-11-23 Last updated: 2016-11-25Bibliographically approved

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